var __defaultFired = false;
    var __nonMSDOMBrowser = (window.navigator.appName.toLowerCase().indexOf("explorer") == -1);       
    function WebForm_FireDefaultButton(event, target) {
        if (!__defaultFired && event.keyCode == 13 && !(event.srcElement && (event.srcElement.tagName.toLowerCase() == "textarea"))) {
            var defaultButton;
            if (__nonMSDOMBrowser) {
                defaultButton = document.getElementById(target);
            }
            else {
                defaultButton = document.all[target];
            }                     
            if (defaultButton && typeof(defaultButton.click) != "undefined") {                   
                __defaultFired = true;                                                           
                defaultButton.click();
                event.cancelBubble = true;
                if (event.stopPropagation) event.stopPropagation();
                return false;
            }
            else if(typeof(defaultButton.click) == "undefined"){
                var clickevent=document.createEvent("MouseEvents")
                clickevent.initEvent("click", true, true)                                                                                     
                __defaultFired = true;                                                           
                defaultButton.dispatchEvent(clickevent)
                event.cancelBubble = true;
                if (event.stopPropagation) event.stopPropagation();
                return false;                   
            }
        }
        return true;
    }        
    // JScript File